Momentum and CollisionHardBloom L3
Question
On a smooth carom board, a coin moving in negative y–direction with a speed of 3 m/s is being hit at the point (4, 6) by a striker moving along negative x–axis. The line joining centres of the coin and the striker just before the collision is parallel to x–axis. After collision the coin goes into the hole located at the origin. Masses of the striker and the coin are equal. Considering the collision to be elastic, the initial and final speeds of the striker in m/s will be
Options
A.(1.2, 0)
B.(2, 0)
C.(3, 0)
D.None of these
Solution
Sol. 
Resultant of 4 & 3 is along AO.
tanθ = $\frac{4}{6} = \frac{4}{3}$ ⇒ u = 2 m/s
striker v = $\left\{ \begin{aligned} & u = 2 \Rightarrow Before \\ & 0 \Rightarrow After \end{aligned} \right.\ $
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